A view has always to return something...

[kalbermattenm]

Here: https://github.com/sitn/infolica/blob/master/back/infolica/views/numero.py#L151-L171

[kalbermattenm]

And here: https://github.com/sitn/infolica/blob/master/back/infolica/views/numero.py#L349

[kalbermattenm]

This shouldn't be necessary: https://github.com/sitn/infolica/blob/master/back/infolica/views/numero.py#L326